CN115624892B - Device and method for generating simulated boiler flue gas aerosol - Google Patents
Device and method for generating simulated boiler flue gas aerosol Download PDFInfo
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- CN115624892B CN115624892B CN202211080294.4A CN202211080294A CN115624892B CN 115624892 B CN115624892 B CN 115624892B CN 202211080294 A CN202211080294 A CN 202211080294A CN 115624892 B CN115624892 B CN 115624892B
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- 239000000443 aerosol Substances 0.000 title claims abstract description 72
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims description 16
- 239000003546 flue gas Substances 0.000 title claims description 16
- 238000000034 method Methods 0.000 title claims description 14
- 239000007788 liquid Substances 0.000 claims abstract description 78
- 239000000725 suspension Substances 0.000 claims abstract description 69
- 238000010438 heat treatment Methods 0.000 claims abstract description 68
- 239000002105 nanoparticle Substances 0.000 claims abstract description 62
- 239000002245 particle Substances 0.000 claims abstract description 50
- 230000007246 mechanism Effects 0.000 claims abstract description 21
- 238000005086 pumping Methods 0.000 claims abstract description 19
- 230000001105 regulatory effect Effects 0.000 claims abstract description 14
- 238000007599 discharging Methods 0.000 claims abstract description 11
- 239000007789 gas Substances 0.000 claims description 131
- 238000001514 detection method Methods 0.000 claims description 19
- 230000002572 peristaltic effect Effects 0.000 claims description 15
- 238000003860 storage Methods 0.000 claims description 10
- 238000005507 spraying Methods 0.000 claims description 8
- 238000001132 ultrasonic dispersion Methods 0.000 claims description 8
- 239000002270 dispersing agent Substances 0.000 claims description 7
- 230000001737 promoting effect Effects 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000012546 transfer Methods 0.000 claims description 5
- 238000004364 calculation method Methods 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000012806 monitoring device Methods 0.000 claims description 3
- 230000016507 interphase Effects 0.000 claims description 2
- 238000005538 encapsulation Methods 0.000 claims 1
- 238000002360 preparation method Methods 0.000 claims 1
- 239000000779 smoke Substances 0.000 abstract description 12
- 238000005054 agglomeration Methods 0.000 abstract description 5
- 230000002776 aggregation Effects 0.000 abstract description 5
- 239000000843 powder Substances 0.000 description 11
- 239000000428 dust Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 7
- 239000007921 spray Substances 0.000 description 5
- 239000010881 fly ash Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000005243 fluidization Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 239000011859 microparticle Substances 0.000 description 1
- 239000002366 mineral element Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000006070 nanosuspension Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910021642 ultra pure water Inorganic materials 0.000 description 1
- 239000012498 ultrapure water Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F33/00—Other mixers; Mixing plants; Combinations of mixers
- B01F33/80—Mixing plants; Combinations of mixers
- B01F33/82—Combinations of dissimilar mixers
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
Abstract
The invention discloses a generating device for simulating boiler smoke aerosol, which comprises a heating furnace body, a discharging pipe, a vertical impinging stream reactor and a preheating furnace, and further comprises: the liquid supply mechanism is connected with the heating furnace body and is used for providing micro-nano particle suspension liquid in the vertical impinging stream reactor, and the liquid supply mechanism comprises a liquid supply assembly, a pumping assembly and a suspension assembly; the suspension assembly comprises a gas pipeline A, a flow regulating device, an air inlet pipe and a gas pipeline B, wherein the gas pipeline A and the gas pipeline B are connected with a gas nozzle B and a gas nozzle A; the invention can promote the micro-nano particle suspension to be in the gas impact area for suspension heating through the liquid supply mechanism, thereby not only realizing continuous and stable output of aerosol particles under the condition of simulating smoke, but also effectively solving the problem of particle agglomeration in the aerosol.
Description
Technical Field
The invention belongs to the technical field of simulation devices, and particularly relates to a device and a method for generating simulated boiler smoke aerosol.
Background
Coal is used as a main primary energy source in China, and has a large proportion in power station boilers, industrial boilers, power equipment in various related industrial fields, daily life of residents and other energy consumption. The coal, after combustion in the boiler, produces solid particles, i.e. soot, which can be suspended in air for a longer period of time. The smoke dust and the gas are combined to form smoke aerosol, and solid particles in the aerosol mainly comprise microparticles and nanoparticles containing mineral elements. In addition, particles with the particle size of more than 100 mu m in the aerosol are easy to settle, a deposition layer is formed on a heating surface of the boiler, and corrosion is generated; particles with a particle size of 0.1-100 μm are the main object of dust removal, wherein dust below 10 μm and nanoparticles with a particle size below 100nm are the most harmful to human body and environment.
It can be seen that the boiler flue gas contains a certain amount of aerosol particles besides the main gases such as CO 2、H2 O, N 2 and the like. Therefore, in studying problems such as particle deposition or particle removal on the heated surface of the boiler, a specific device is required to simulate the generation of boiler flue gas aerosol. In this case, an aerosol generating device is usually required. Through investigation, the structure and the function of the existing aerosol generating device are uneven, and the following description describes several typical aerosol generating devices: (1) Fluidized bed type aerosol generator, for example, chinese patent publication No. CN1657174a discloses a fluidized bed dry type aerosol generating device, which essentially utilizes fluidization characteristics of solid particles to pulverize powdery multiparticulate polymer mixed in a bed material into a single particle dispersion state, the fine particles are then carried out of the bed layer by air flow into the air flow, and large particles polymerized inside are removed by separation, thus obtaining aerosol. The aerosol obtained in this way is greatly affected by the degree of breakage of the particulate polymer, and it is difficult to obtain an aerosol having a uniform particle diameter. (2) A push-type dust aerosol generating apparatus, for example, chinese patent publication No. CN102166488B proposes a push-type dust aerosol generating apparatus, which includes a front open injector, a stepping motor, a ball screw, a push block, a particulate ball, and a dust dissolution chamber. The ball screw is driven by the stepping motor to rotate, so that the ball nut drives the pushing block to move, the pushing block pushes powder to enter the dust dissolving cavity to collide with the particle ball driven by the air flow entering through the air inlet interface to generate atomization, and the atomized powder is sent into the airtight diffusion bin through the air outlet interface and the pipeline, so that the aerosol with controllable feeding amount and difficult blockage is obtained. However, in the aerosol obtained in this way, dust is dispersed by collision with the particulate balls, and there is a case where the concentration of the aerosol is unevenly distributed. (3) A novel dust aerosol generator is proposed by a brush aerosol generator, such as a Chinese patent with publication number CN 210496322U, and comprises a powder feeding mechanism, a powder conveying mechanism and a powder spraying mechanism. The stirring body of the powder feeding mechanism can stir the powder stored in the cavity, so that the powder stored in the cavity can be mixed with air when being stirred, the fluffy state of the powder is maintained, the dispersed and transported materials are convenient, and the powder carried by the brush roller is sent to the powder spraying mechanism. However, the amount of the feed in this feeding method is greatly affected by the adhesion property between the brush and the particles, so that the concentration of the aerosol is not easily controlled.
In summary, the existing aerosol generating devices have advantages and disadvantages, but in the process of simulating boiler smoke aerosol, the aerosol generating device is required to simulate the boiler smoke components, and aerosol particles are required to be continuously, stably, uniformly and dispersedly output. While the existing aerosol generating device can realize continuous supply of aerosol particles to a certain extent, the existing aerosol generating device is difficult to solve the problem of particle agglomeration, especially for nano particles, the agglomeration phenomenon is easy to occur, and the occurrence of the phenomenon can seriously interfere with analysis of experimental results. Therefore, how to solve the problem of agglomeration of aerosol particles under the precondition of ensuring the simulation precision is a great difficulty in simulating the aerosol generating device at present.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a generating device for simulating boiler smoke aerosol, which solves the problems.
In order to achieve the above purpose, the invention is realized by the following technical scheme: a generating device for simulating boiler flue gas aerosol, includes heating furnace body, vertical impinging stream reactor, discharging pipe and preheating furnace, still includes:
The liquid supply mechanism is connected with the heating furnace body and is used for providing micro-nano particle suspension liquid added with a small amount of organic dispersing agent in the vertical impinging stream reactor, and the liquid supply mechanism comprises a liquid supply assembly, a pumping assembly and a suspension assembly;
The liquid supply assembly comprises a liquid storage tank and ultrasonic dispersion equipment, the liquid storage tank is connected with the heating furnace body, and the micro-nano particle suspension 4 is positioned in the liquid storage tank;
The suspended assembly comprises a gas pipeline A, a flow regulating device, an air inlet pipe and a gas pipeline B, wherein the gas pipeline A and the gas pipeline B penetrate through the heating furnace body and extend into the vertical impinging stream reactor, the flow regulating device is connected with the gas pipeline A and the gas pipeline B, the air inlet pipe is connected with the flow regulating device, the gas pipeline A and the gas pipeline B are respectively and movably connected with a gas nozzle B and a gas nozzle A, and the gas pipeline A and the gas pipeline B penetrate through the preheating furnace and are connected with the preheating furnace;
The liquid supply assembly is used for guiding micro-nano particle suspension liquid which is scattered by ultrasonic dispersion equipment and is formed by liquid package into the gas pipeline A through the pumping assembly, the flow regulating device is used for dispersing gas which is guided into the gas pipeline A and the gas pipeline B and carrying out preheating treatment through the preheating furnace, the gas nozzle B and the gas nozzle A are used for spraying the preheated gas relatively, the gas in the gas pipeline A is used for spraying the micro-nano particle suspension liquid into the vertical impinging stream reactor through the gas nozzle B and promoting the micro-nano particle suspension liquid to collide with the gas sprayed in the gas nozzle A, and the impinging gas is used for promoting the micro-nano particle suspension liquid to be in a high turbulence state and a mode of alternate heat transfer and mass transfer when the impinging gas is formed in the center of the vertical impinging stream reactor to react in the vertical impinging stream reactor, so that aerosol with uniform concentration and good dispersibility is prepared.
Based on the technical scheme, the invention also provides the following optional technical schemes:
The technical scheme is as follows: and a detection mechanism for monitoring device data is arranged on the heating furnace body.
The technical scheme is as follows: the particle collecting device is arranged on the heating furnace body, embedded in the heating furnace body and movably connected with the heating furnace body.
The technical scheme is as follows: the peristaltic pump is connected with the heating furnace body through the support frame, the liquid conveying pipeline is connected with an outlet pipe of the peristaltic pump, one end of the liquid conveying pipeline extends into the gas pipeline A, and a liquid nozzle is movably connected to the liquid conveying pipeline.
The technical scheme is as follows: the detection mechanism comprises a controller, an electronic balance and a pressure gauge, wherein the electronic balance is fixedly connected with the heating furnace body, the pressure gauge is fixedly connected with the discharging pipe, the controller is embedded on the heating furnace body and is fixedly connected with the heating furnace body, and the pressure gauge and the electronic balance are electrically connected with the controller in average, and the detection mechanism further comprises:
the temperature detection assembly is electrically connected with the controller and is used for detecting the temperature of the furnace body and the temperature of the aerosol outlet; and
And the gas flow detection assembly is electrically connected with the controller and is used for detecting the flow rate of the gas flowing into the gas pipeline A and the gas pipeline B.
The technical scheme is as follows: the temperature detection assembly comprises a thermocouple A and a thermocouple B, wherein the thermocouple A is positioned inside the heating furnace body and is fixedly connected with the heating furnace body, the thermocouple B is positioned inside the discharging pipe and is fixedly connected with the discharging pipe, and the thermocouple A and the thermocouple B are electrically connected with the controller.
A method based on a generating device for simulating boiler smoke aerosol comprises the steps of:
s1: preparing a micro-nano particle suspension with a certain concentration through calculation, adding an organic dispersing agent, and adopting ultrasonic waves for further treatment to obtain a uniformly dispersed micro-nano particle suspension;
s2: starting a heating furnace body, a vertical impinging stream reactor and a preheating furnace and promoting the temperature of the heating furnace body to be in a stable state;
S3: starting a liquid supply assembly and a pumping assembly, and pumping micro-nano particle suspension provided by the liquid supply assembly into the suspension assembly by using the pumping assembly;
S4: the suspension assembly promotes the micro-nano particle suspension to be in an impact area by spraying out convection gas preheated by the preheating furnace, and promotes the micro-nano particle suspension to perform uniform and rapid reaction in the vertical impact flow reactor;
S5: an aerosol of a suitable concentration is obtained and discharged through a discharge pipe.
Advantageous effects
The invention provides a generating device and a generating method for simulating boiler smoke aerosol, which have the following beneficial effects compared with the prior art:
1. The device can utilize the peristaltic pump to continuously pump the micro-nano particle suspension containing the organic dispersing agent and scattered by the ultrasonic dispersing equipment placed in the liquid supply assembly into the liquid conveying pipeline, and the liquid conveying pipeline sprays the micro-nano particle suspension into the gas pipeline A through the liquid nozzle, so that the technical effect of continuously and stably supplying the liquid for the suspension assembly is realized;
2. the device applies the basic principle of impinging stream to enable two air streams to impinge oppositely in a vertical impinging stream reactor, an impinging zone is formed in the central zone of the reactor, the inter-phase speed is very high in the impinging zone, the turbulence is strong, and micro-nano particles can do reciprocating permeation oscillation motion in the impinging zone. This means that this heating not only heats the particles fast but also for a long time. Therefore, the micro-nano particle suspension drops entering the heating furnace through the gas pipeline A can be rapidly broken and evaporated in the process of approaching the impact area, and the micro-nano particles can be rapidly dried in a limited space and have enough residence time to be rapidly heated to the preset temperature. The simulated flue gas generated by the device mainly comprises N 2, water vapor, O 2 and a small amount of CO 2, and aerosol particles are derived from a micro-nano fly ash particle suspension. The generating device for simulating the boiler smoke aerosol has the advantages that the structure is simple and compact, and the technical effects of continuous, stable, uniform and dispersed output of the boiler smoke aerosol particles are finally realized;
3. The device can control parameters such as gas components, gas flow rate, particle temperature, particle concentration, particle size and the like, and realize the technical effect of accurately controlling and outputting the boiler flue gas aerosol;
4. compared with the traditional aerosol generating device, the device has limited control output capability on the nano particles, and is applicable to simulating specific nano particles and micron particle aerosol particles, so the device has wide application range and comprehensive simulation effect.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present invention.
Reference numerals annotate: 1. an electronic balance; 2. a liquid storage tank; 3. an ultrasonic dispersion device; 4. a micro-nano particle suspension; 5. a peristaltic pump; 6. a liquid delivery conduit; 7. heating the furnace body; 8. a gas pipeline A; 9. A temperature control console; 10. a thermocouple A; 11. a flow rate adjusting device; 12. an air inlet pipe; 13. a gas pipeline B; 14. a particle collection device; 15. a vertical impinging stream reactor; 16. a gas nozzle A; 17. a controller; 18. a thermocouple; 19. a discharge pipe; 20. a pressure gauge; 21. an impact zone; 22. a gas nozzle B; 23. a liquid nozzle; 24. a preheating furnace.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Specific implementations of the invention are described in detail below in connection with specific embodiments.
Referring to fig. 1, for an embodiment of the present invention, a generating device for simulating boiler flue gas aerosol includes a heating furnace 7, a vertical impinging stream reactor 15, a discharging pipe 19, and a preheating furnace 24, wherein the vertical impinging stream reactor 15 is connected with the heating furnace 7, the heating furnace 7 is fixedly connected with the discharging pipe 19 penetrating through the vertical impinging stream reactor 15, and further includes:
the liquid supply mechanism is connected with the heating furnace body 7 and is used for providing micro-nano particle suspension 4 in the vertical impinging stream reactor 15, and comprises a liquid supply assembly, a pumping assembly and a suspension assembly;
the liquid supply assembly comprises a liquid storage tank 2 and ultrasonic dispersion equipment 3, the liquid storage tank 2 is fixedly connected with a heating furnace body 7 through an electronic balance 1, and the micro-nano particle suspension 4 is positioned in the liquid storage tank 2;
The suspended assembly comprises a gas pipeline A8, a flow regulating device 11, an air inlet pipe 12 and a gas pipeline B13, wherein the gas pipeline A8 and the gas pipeline B13 penetrate through the heating furnace body 7 and extend into the vertical impinging stream reactor 15, the flow regulating device 11 is fixedly connected with the gas pipeline A8 and the gas pipeline B13, the air inlet pipe 12 is fixedly connected with the flow regulating device 11, the gas pipeline A8 and the gas pipeline B13 are respectively in threaded connection with a gas nozzle B22 and a gas nozzle A16, and the gas pipeline A8 and the gas pipeline B13 penetrate through the preheating furnace 24 and are fixedly connected with the preheating furnace 24;
The liquid supply assembly introduces micro-nano particle suspension 4 which is scattered by ultrasonic dispersion equipment 3 and is wrapped by liquid into a gas pipeline A8 through a pumping assembly, a flow regulating device 11 disperses the gas which is introduced into an air inlet pipe 12 into the gas pipeline A8 and the gas pipeline B13 and carries out preheating treatment through a preheating furnace 24, a gas nozzle B22 and a gas nozzle A16 relatively spray out the preheated gas, the gas in the gas pipeline A8 sprays the micro-nano particle suspension 4 into a vertical impinging stream reactor 15 through the gas nozzle B22 and promotes the micro-nano particle suspension 4 to collide with the gas sprayed out of the gas nozzle A16, and the impinging gas promotes the micro-nano particle suspension 4 to be in a highly turbulent state and in a way of alternately transferring heat and mass when reacting in the vertical impinging stream reactor 15 through forming an impinging zone 21 in the center of the vertical impinging stream reactor 15, so that aerosol with uniform concentration and good dispersibility and no agglomeration phenomenon can be prepared.
Preferably, the solute of the micro-nano particle suspension 4 is fly ash particles generated by combustion of fuel or simulated fly ash particles having a composition close to that of the fly ash particles, the particle size is in the micro-or nano-scale, collectively referred to herein as micro-nano particles, and the solvent is ultrapure water. The micro-nanoparticle suspension 4 contains an organic dispersant. The purpose of this arrangement is to facilitate maintenance of the micro-nano particle suspension 4 in a dispersed state within the pipe.
Preferably, the heating furnace body 7 is detachably connected with a temperature control console 9, and the temperature control console 9 is electrically connected with the heating furnace body 7. The purpose of this arrangement is to facilitate the regulation and control of the temperature in the heating furnace body 7 by the relevant technician.
Preferably, the temperature control console 9 is connected to the heating furnace body 7 by a bolt assembly (not shown). The purpose of this arrangement is to facilitate the removal and maintenance of the temperature control console 9 by the relevant technician.
Preferably, the heating furnace body 7 is provided with a particle collecting device 14, and the particle collecting device 14 is embedded in the heating furnace body 7 and is movably connected with the heating furnace body 7. The purpose of this arrangement is to collect and mass-meter the ash deposited inside the furnace body 7.
Preferably, a heat-insulating layer (not shown) is embedded in the heating furnace body 7, and the heat-insulating layer is fixedly connected with the heating furnace body 7. The purpose of this arrangement is to keep the furnace body 7 warm.
In the embodiment of the invention, a related technician starts the heating furnace body 7 and causes the temperature in the heating furnace body 7 to be in a stable state, the liquid supply component guides the micro-nano particle suspension 4 into the gas pipeline A8 through the pumping component, wherein the liquid supply component utilizes the ultrasonic dispersion equipment 3 to sufficiently scatter particles in the micro-nano particle suspension 4, causes the condition that concentration distribution caused by the particles not to be deposited in a solution is uneven, the flow regulating device 11 disperses the gas guided in the gas inlet pipe 12 into the gas pipeline A8 and the gas pipeline B13 and is relatively sprayed out from the gas nozzle B22 and the gas nozzle A16, the gas in the gas pipeline A8 sprays the micro-nano particle suspension 4 into the vertical impact flow reactor 15 through the gas nozzle B22 and causes the micro-nano particle suspension 4 to collide with the gas sprayed out from the gas nozzle A16, and the impact gas causes the micro-nano particle suspension 4 to be in a high dynamic state and in a phase-to-phase heat transfer mode when the impact zone 21 is formed in the center of the vertical impact flow reactor 15 to react in the vertical impact flow reactor 15, and the technical effect of uniform mass transfer and good dispersion of the gas is achieved.
Referring to fig. 1, as an embodiment of the present invention, a detecting mechanism for monitoring device data is provided on a heating furnace body 7.
Preferably, the detection mechanism includes a controller 17, an electronic balance 1 and a pressure gauge 20, the electronic balance 1 is fixedly connected with the heating furnace body 7, the pressure gauge 20 is fixedly connected with the discharging pipe 19, the controller 17 is embedded on the heating furnace body 7 and is fixedly connected with the heating furnace body 7, the pressure gauge 20 and the electronic balance 1 are electrically connected with the controller 17, and the detection mechanism further includes:
the temperature detection component is electrically connected with the controller 17 and is used for detecting the temperature of the furnace body and the temperature of the aerosol outlet;
The gas flow detection component is electrically connected with the controller 17 and is used for detecting the flow rate of the gas flowing into the gas pipeline A8 and the gas pipeline B13. The electronic balance 1 can weigh the mass change of the suspension containing micro-nano particles in real time and feed the mass change back to the controller 17, so as to play a role in monitoring the flow output precision of the peristaltic pump, meanwhile, the pressure gauge 20 can monitor and feed back the pressure of an aerosol outlet in real time, the temperature detection assembly can monitor the temperature in the furnace body 7 and the temperature of the aerosol outlet in real time, the gas flow detection assembly can detect the flow rate of the gas in the gas pipeline A8 and the gas pipeline B13 and feed back the controller 17, and the purpose of the arrangement is that the electronic balance 1, the temperature detection assembly, the gas flow detection assembly and the pressure gauge 20 are utilized to detect and feed back various data of the device to the controller 17, and the controller 17 adjusts the temperature of the furnace body, the gas pipeline A8, the gas management B13 and the input quantity of the micro-nano particle suspension 4 in real time according to feedback information.
Preferably, the temperature detecting assembly comprises a thermocouple A10 and a thermocouple B18, wherein the thermocouple A10 is positioned in the heating furnace body 7 and is fixedly connected with the heating furnace body 7, the thermocouple B18 is positioned in the discharging pipe 19 and is fixedly connected with the discharging pipe 19, and the thermocouple A10 and the thermocouple B18 are electrically connected with the controller 17. The purpose of this arrangement is to monitor the temperature in the heating furnace body 7 and the temperature of the micro-nano suspended particles in the exhaust furnace body in real time.
Preferably, the gas flow detection assembly includes a gas flow sensor a (not shown) and a gas flow sensor B (not shown), wherein the gas flow sensor a is disposed in the gas pipe A8 and is fixedly connected with the gas pipe A8, the gas flow sensor B is disposed in the gas pipe B13 and is fixedly connected with the gas pipe B13, and the gas flow sensor a and the gas flow sensor B are electrically connected with the controller 17. The purpose of this arrangement is to monitor the flow rate of gas flowing into the vertical impinging stream reactor 15 in real time.
Preferably, the controller 17 is electrically connected to the particle collection device. The purpose of this arrangement is to provide data feedback on the dust collected by the particle collection device in the furnace.
Preferably, the controller 17 is electrically connected to the peristaltic pump 5 and the impinging stream reactor 15. The purpose of this arrangement is to facilitate the corresponding operations by the relevant technician.
In the embodiment of the invention, the purpose of this arrangement is to monitor the temperature of the heating furnace body 7, the aerosol outlet pressure, the aerosol outlet temperature and the mass data of the micro-nano particle suspension 4 in real time by using a monitoring mechanism.
Preferably, the aerosol concentration calculation method is as follows:
Setting parameters, wherein the flow rates of the gas pipeline B13 and the gas pipeline A8 are Q 1(m3/s)、Q2 (m3/s respectively), configuring the concentration of the micro-nano particle suspension 4 to be c L(g/m3, setting the water supply rate of the peristaltic pump 5 to be Q R (m3/s, assuming normal temperature T 1 (DEG C), designing the required aerosol temperature to be T 2 (DEG C), and the gas molar volume to be 22.4L/mol (under the standard condition), wherein the particles collected in the particle collection device are weighed after the equipment operates for a certain time, and the ratio of the mass of the collected particles to the operating time is m' (g/s). It should be noted that the small amount of organic dispersant contained in the micro-nano suspension 4 has negligible evaporation and combustion products.
As the air expands due to heating, the volume flow rate Q' 1(m3/s)、Q'2(m3/s of the air introduced by the gas line B13 and the gas line A8 after being actually heated) is:
The volume Q H(m3/s) of the liquid ejected from the liquid nozzle 22 after evaporation is:
Wherein ρ is the density of water in kg/m 3.
The concentration c (g/m 3) of the actually sprayed aerosol is
Wherein m p (g/s) is the discharge rate of the discharge pipe 19, and has the following relation with the water supply rate Q R of the peristaltic pump 5 and the concentration c L of the micro-nano particle suspension 4:
Referring to fig. 1, as an embodiment of the present invention, the pumping assembly includes a peristaltic pump 5 and a liquid delivery tube 6, the peristaltic pump 5 is fixedly connected to the heating furnace 7 through a supporting frame (not shown), the liquid delivery tube 6 is fixedly connected to a water outlet pipe of the peristaltic pump 5, one end of the liquid delivery tube 6 extends into the gas pipeline A8, and a liquid nozzle 23 is screwed on the liquid delivery tube 6.
In the embodiment of the present invention, the purpose of this arrangement is to continuously pump the micro-nano particle suspension 4 placed in the liquid supply assembly into the liquid delivery pipe 6 by using the peristaltic pump 5, and the liquid delivery pipe 6 sprays the micro-nano particle suspension 4 into the gas pipe A8 through the liquid nozzle 23, so as to achieve the technical effect of supplying liquid to the suspension assembly.
A method based on a generating device for simulating boiler flue gas aerosol, comprising the steps of:
S1: preparing a micro-nano particle suspension 4 with a certain concentration through calculation, adding a small amount of organic dispersing agent, and adopting ultrasonic wave for further treatment to obtain a uniformly dispersed micro-nano particle suspension 4;
s2: starting the heating furnace body 7, the vertical impinging stream reactor 15 and the preheating furnace 24 and promoting the temperature of the heating furnace body 7 to be in a stable state;
S3: starting a liquid supply assembly and a pumping assembly, and pumping the micro-nano particle suspension 4 provided by the liquid supply assembly into the suspension assembly by using the pumping assembly;
S4: the suspension assembly promotes the micro-nano particle suspension 4 to perform uniform and rapid reaction in the vertical impinging stream reactor 15 by ejecting convection gas preheated by the preheating furnace 24 to promote the micro-nano particle suspension 4 to be in an impinging zone;
S5: an aerosol of a suitable concentration is obtained and the aerosol particles are discharged through a discharge pipe 19.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A generating device for simulating boiler flue gas aerosol, comprising a heating furnace body (7), a vertical impinging stream reactor (15), a discharge pipe (19) and a preheating furnace (24), characterized in that it further comprises:
The liquid supply mechanism is connected with the heating furnace body (7) and is used for providing micro-nano particle suspension liquid (4) in the vertical impinging stream reactor (15), and comprises a liquid supply assembly, a pumping assembly and a suspension assembly;
The liquid supply assembly comprises a liquid storage tank (2) and ultrasonic dispersion equipment (3), the liquid storage tank (2) is connected with a heating furnace body (7), and the micro-nano particle suspension liquid (4) is positioned in the liquid storage tank (2);
The air-conditioner comprises a suspended component and is characterized in that the suspended component comprises an air pipeline A (8), a flow regulating device (11), an air inlet pipe (12) and an air pipeline B (13), wherein the air pipeline A (8) and the air pipeline B (13) penetrate through a heating furnace body (7) and extend into a vertical impinging stream reactor (15), the flow regulating device (11) is connected with the air pipeline A (8) and the air pipeline B (13), the air inlet pipe (12) is connected with the flow regulating device (11), the air pipeline A (8) and the air pipeline B (13) are respectively and movably connected with an air nozzle B (22) and an air nozzle A (16), and the air pipeline A (8) and the air pipeline B (13) penetrate through a preheating furnace (24) and are connected with the preheating furnace (24);
The liquid supply assembly is used for guiding micro-nano particle suspension liquid (4) which is scattered by ultrasonic dispersion equipment (3) and is formed by liquid encapsulation into a gas pipeline A (8) through a pumping assembly, a flow regulating device (11) is used for dispersing gas which is guided into an air inlet pipe (12) into the gas pipeline A (8) and the gas pipeline B (13) and carrying out preheating treatment through a preheating furnace (24), a gas nozzle B (22) and a gas nozzle A (16) are used for relatively spraying out preheated gas, the gas in the gas pipeline A (8) is used for spraying the micro-nano particle suspension liquid (4) into a vertical impinging stream reactor (15) through the gas nozzle B (22) and causing the micro-nano particle suspension liquid (4) to collide with the gas sprayed out in the gas nozzle A (16), and impinging gas is used for causing the micro-nano particle suspension liquid (4) to be in a high-moving state and in a way of inter-phase mass transfer when reacting in the vertical impinging stream reactor (15) through forming an impinging zone (21) in the center, so that aerosol preparation with good concentration uniformity and dispersibility is realized.
2. The generating device for simulating boiler flue gas aerosol according to claim 1, wherein a detection mechanism for monitoring device data is provided on the heating furnace body (7).
3. The generating device for simulating boiler flue gas aerosol according to claim 1, wherein the heating furnace body (7) is provided with a particle collecting device (14), and the particle collecting device (14) is embedded in the heating furnace body (7) and is movably connected with the heating furnace body (7).
4. The generating device for simulating boiler flue gas aerosol according to claim 1, wherein the pumping assembly comprises a peristaltic pump (5) and a liquid conveying pipeline (6), the peristaltic pump (5) is connected with the heating furnace body (7) through a supporting frame, the liquid conveying pipeline (6) is connected with a water outlet pipe of the peristaltic pump (5), one end of the liquid conveying pipeline (6) extends into the gas pipeline a (8), and a liquid nozzle (23) is movably connected to the liquid conveying pipeline (6).
5. The generating device for simulating boiler flue gas aerosol according to claim 2, wherein the detecting mechanism comprises a controller (17), an electronic balance (1) and a pressure gauge (20), the electronic balance (1) is connected with the heating furnace body (7), the pressure gauge (20) is connected with the discharging pipe (19), the controller (17) is embedded on the heating furnace body (7) and is connected with the heating furnace body (7), and the pressure gauge (20) and the electronic balance (1) are electrically connected with the controller (17), and further comprises:
The temperature detection assembly is electrically connected with the controller (17) and is used for detecting the temperature of the furnace body and the outlet temperature of aerosol; and
And the gas flow detection assembly is electrically connected with the controller (17) and is used for detecting the flow rate of the gas flowing into the gas pipeline A (8) and the gas pipeline B (13).
6. The device for generating simulated boiler flue gas aerosol as claimed in claim 5, wherein said temperature detection assembly comprises a thermocouple a (10) and a thermocouple B (18), thermocouple a (10) being located inside the heating furnace body (7) and being connected to the heating furnace body (7), thermocouple B (18) being located inside the discharge pipe (19) and being connected to the discharge pipe (19), both thermocouple a (10) and thermocouple B (18) being electrically connected to the controller (17).
7. Method for simulating a boiler flue gas aerosol generating device according to claim 1, comprising the steps of:
s1: preparing a micro-nano particle suspension (4) with a certain concentration through calculation, adding an organic dispersing agent, and adopting ultrasonic wave for further treatment to obtain a uniformly dispersed micro-nano particle suspension (4);
s2: starting the heating furnace body (7), the vertical impinging stream reactor (15) and the preheating furnace (24) and promoting the temperature of the heating furnace body (7) to be in a stable state;
S3: starting a liquid supply assembly and a pumping assembly, and pumping micro-nano particle suspension (4) provided by the liquid supply assembly into the suspension assembly by using the pumping assembly;
S4: the suspension assembly promotes the micro-nano particle suspension (4) to perform uniform and rapid reaction in the vertical impinging stream reactor (15) in a mode of promoting the micro-nano particle suspension (4) to be in an impinging zone by spraying out convection gas preheated by the preheating furnace (24);
s5: an aerosol of a suitable concentration is obtained and discharged through a discharge pipe (19).
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